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  1. #include <iostream>
  2. #include <map>
  3. #include <string>
  4. #include <vector>
  5. #include <functional>
  6. using namespace std;
  7.  
  8. struct Car {
  9.   string name;
  10.   int age;
  11.   string manufacturer;
  12. };
  13.  
  14. map<string,function<bool(Car&,string&)>> carFieldEq = {
  15. 	{"name", [] (Car &c, string& cmp) { return c.name == cmp; }}
  16. ,   {"age", [] (Car &c, string& cmp) { return to_string(c.age) == cmp; }}
  17. ,   {"manufacturer", [] (Car &c, string& cmp) { return c.manufacturer == cmp; }}
  18. };
  19.  
  20. map<string,function<bool(Car&,string&)>> carFieldLess = {
  21. 	{"name", [] (Car &c, string& cmp) { return c.name < cmp; }}
  22. ,   {"age", [] (Car &c, string& cmp) { return c.age < std::stoi(cmp); }}
  23. ,   {"manufacturer", [] (Car &c, string& cmp) { return c.manufacturer < cmp; }}
  24. };
  25.  
  26. int main() {
  27. 	auto cars = vector<Car> {
  28. 		{"Impala", 10, "Chevrolet"}
  29. 	,   {"Focus", 3, "Ford"}
  30. 	,   {"Jetta", 3, "VW"}
  31. 	};
  32. 	string fieldNameEq, eqCmp;
  33. 	cin >> fieldNameEq >> eqCmp;
  34. 	cout << "==== Cars matching " << fieldNameEq << "==" << eqCmp << ":" << endl;
  35. 	for (auto &c : cars) {
  36. 		if (carFieldEq[fieldNameEq](c, eqCmp)) {
  37.     		cout << c.name << " " << c.age << " " << c.manufacturer << endl;
  38. 		}
  39. 	}
  40. 	string fieldNameLess, lessCmp;
  41. 	cin >> fieldNameLess >> lessCmp;
  42. 	cout << "==== Cars matching " << fieldNameLess << "<" << lessCmp << ":" << endl;
  43. 	for (auto &c : cars) {
  44. 		if (carFieldLess[fieldNameLess](c, lessCmp)) {
  45.     		cout << c.name << " " << c.age << " " << c.manufacturer << endl;
  46. 		}
  47. 	}	
  48. 	return 0;
  49. }
  50.  
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
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manufacturer Ford
age 6
stdout
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==== Cars matching manufacturer==Ford:
Focus 3 Ford
==== Cars matching age<6:
Focus 3 Ford
Jetta 3 VW
https://ideone.com/AXBF7N
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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